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So even if two users have the same password, their hash values will be completely different. Note that you also uppercase the username before passing it to the MD5 hash function, since the username will uppercased before being passed to the custom authentication function, as described earlier. The authentication function can now be modified so that it performs the same hash function on the username and password that the user is trying to authenticate with, and compare the hash value with the hash value that is stored in the user_repository table, as shown in Listing 3-14. Listing 3-14. Modified pkg_auth Package to Work with Password Hashes create or replace package pkg_auth as function authenticate(p_username in varchar2, p_password in varchar2) return boolean; end; create or replace package body pkg_auth as -- wrapper function to compute the MD5 hash function md5hash (p_input in varchar2) return varchar2 is begin return upper(dbms_obfuscation_toolkit.md5 ( input => utl_i18n.string_to_raw(p_input))); end md5hash; function authenticate(p_username in varchar2, p_password in varchar2) return boolean is v_result integer := 0; v_hash varchar2(32); begin v_hash := md5hash(p_username || p_password); select 1 into v_result from user_repository where upper(username) = upper(p_username) and upper(password_hash) = v_hash; return(v_result = 1); exception when no_data_found then return false; end authenticate; end;

Summary

To change the ports where OpenWBEM is listening, the parameters http_serverhttp_port and http_serverhttps_port can be changed To disable a port, give the option -1 to any of these parameters for example, the unsecure port can be disabled by default with the parameter http_serverhttp_port = -1 Logging configuration: The owcimomdconf file offers advanced options to configure where and how much logging occurs, what type of errors are logged, and the log size, filename, and format For a complete list of these, consult the documentation at http://wwwnovellcom/documentation/oes Debug logging configuration: In addition to the normal logging configuration, additional debug logging configuration can be specified as well For instance, the options used to configure debug logging can be configured to use different colors for different kinds of log messages For a complete overview of the available options, consult the documentation at http://wwwnovellcom/documentation/oes.

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Now you just need to remember to drop the plain text password column from the user_repository table so that the plain text password cannot be viewed: apexdemo@10gR2> alter table user_repository drop(password); Table altered. With a few relatively simple changes to the user_repository table and your authentication scheme, you have made your whole application much more secure. Also, by keeping the authentication code within a package, you are forming the basis of a security module that can be easily reused in different applications.

Additional logs: If the default logging configuration is still not enough, additional logs can also be created so that specific types of information are logged in a certain way More information about these additional logs can be found in the documentation at http://wwwnovellcom/documentation/oes To modify the configuration file, I recommend you read it thoroughly: there are lots of comments explaining what happens in the file (as shown in Figure 20-1) Be aware, however, that in most situations, the default values work perfectly well, and you almost never need to change these settings if you just want to get Health Monitoring Services running..

Note It has been rumored that the dbms_obfuscation_toolkit is due to be deprecated. As of the writing of this book, it is still available and is documented in the Oracle 11g documentation. The code shown in this chapter that uses dbms_obfuscation_toolkit works, and it is much better than storing plain-text passwords (which is just horrendous and should be banned!). However, you may want to look at using the DBMS_CRYPTO package instead. The DBMS_CRYPTO package includes routines to provide a hash based on the MD5 or SHA algorithms.

Figure 20-1. The configuration file for OpenWBEM is well documented. In most cases, you never need to change its settings.

One of the most important services in OES that uses OpenWBEM to communicate with devices in the network is Health Monitoring Services. It instantly reveals the status of a monitored network server. This section explains how to work with Health Monitoring Services.

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